Sheet feeding mechanism for printing machines



Jan. 24, 1939. w HUCK 2,144,881

SHEET FEEDING MECHANISM FOR PRINTING MACHINES Filed May 9, 1936 3 Sheets-Sheet l INVENTOR.

W7 ia Jan. 24, 1939. w HUCK 2,144,881

' SHEET FEEDING MECHANISM FOR PRINTING MACHINES Filed May 9, 1936 5 Sheets-Sheet 2 3 Sheets-Sheet 3 INVENTOR. fiW

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Patented 1.5. 24, 1939 I F 2,144,881

UNITED STATES PATENT oFFlcE 7 SHEET FEEDING MECHANISM FOR P G MACHINES William F. Huck, Richmond Hill, N. Y., mignor to R. Hoe a 00., Inc., New York, N. Y., a cornotation of New York Application. May 9, 1936, Serial No. 78,802 2 Claims. (Cl. 271-56) This invention in general relates to sheet fed associated therewith, in the usual manner, a printing machines having for its object the profront stop ll serving as a detaining element for vision of means for preventing an improperly fed a properly fed sheet until the sheet is engaged by sheet of material or product from being engaged the usual gripper members (not shown).

by the grippers of a forwarding or sheet taking Operably connected to any suitable member of 5 cylinder after the cylinder tripping mechanism a conventional cylinder tripping mechanism (not has been actuated. shown) is a lever l2, pivoted on a side member or It is also an object of the invention to provide column l3 of the frame structure and swivelled a sheet detaining device for preventing the feedto a link I, hinged at l5 to. a lever I5, pivotally ing of an improperly forwarded sheet to a sheet supported on a stud l1 fastened to the side mem- 0 fed printing machine, of generally improved conber l3 and having hingedly secured thereto a struction, whereby the device will be simple, durlink or rod I8, the upper portion of which passes able and inexpensive in construction, as well as through poppets l9, 2| fastened to levers 22, 23 convenient, practical, serviceable and emcient in respectively. The levers 23 are iourn ll d on 5 its use. studs 24, 25 fastened in spaced relation to an with the foregoing and other objects in view, extension 26 01' a bracket 21 als f tened o th whichwill appear as the description proceeds, the side member l3. Arranged on the rod I8 between invention resides in the combination and arthe poppets l9, 2| is a coil spring 28, the -rod l8 rangement of parts, and in the details of conbeing retained against axial movement in the struction hereinafter described and claimed, it besaid poppets by washers 29, 3i and pins 32, 32'. 2o

ing understood that various changes in the pre- The lever 22 adjacent the poppet I9 is procise embodiment of the invention herein disclosed vided with a shoulder 33, which coacts with a may be made within the scope of what is claimed shoulder or ledge 3| on a latch member 35, keyed without departing from the spirit of the invento a. shaft 36, journalled at one end in the bracket tion. 21 and at its other end in a second bracket 21',

The preferred embodiment of the invention is the bracket 21 being suitably se red o the side illustrated in the accompanying drawings, wheremember l3, and the bracket 21'- to the correin: sponding and opposed side member 31 at the Figure 1 is a fragmentary side elevational view other side of the frame structure. The latch 35 of a sheet fed printing machine showing the inis also provided with a t Shoulder the so vention operatively applied thereto and disclosfunction of which will be described hereinafter. ing same in its normal inoperative position before The lever 23 has an integral extension or latch being actuated by the attached cylinder tripping member 39 provided with a projection or shoulmechanism; der 40, coacting with a shoulder M on the member Figure 2 is a view similar to Figure 1, but show- 35, the latter being further provided with an ex- 35 ing the position of the parts in sheet retaining tension 42, having a stud 43, on which a spring position, after the cylinder tripping mechanism rod 24 is retained by a. pin 45. The rod M is enhas operated to move the latch means, thereby circled by a sprin 45 ta ne in place thereon eifecting the operation of the sheet retaining between a washer 4! and a poppet 48 arranged on means, in order to detain an improperly fed sheet; the Side member upright 0n t e Oute 4 Figure 3 is a fragmentary detail view showing threaded end of the rod 44, lock nuts 49 are the latch means reset in position to retain the p ovided which e v to retain a c llar 50 on the sheet engaging member in inoperative position; rod 44, the said collar, which may preferably be but with the cylinder tripping mechanism still of any su ta l h -a s n mat rial, nortripped; and mally being out of contact with the poppet i8 45 Figure 4 is an elevational view, partly in secbut serving as a stop to limit the thrust of the tion, as seen. in th direction of the arrow 4 of spring rod 4 a consequently, t e e te of Figure 1. movement of the member 35 and the sheet re- Referring more particularly to the drawings taining members hereinafter described, as shown wherein similar characters of reference indicate in Figure 2. 50 corresponding parts in the several views of the To the bracket 27, a stud 5| is secured which preferred form of the invention, I 0 designates serves as a stop for the extension 42 of the latch generally a forwarding or sheet taking cylinder member 35. Fastened to one end of the shaft rotatably mounted on the frame structure of a 36 by a washer 52 and screw 53 is a hand or 55 sheet fed printing machine. The cylinder III has operating lever 54, the shank of the said operat- 55 ing lever being provided with a stud 55 adapted to engage, as described above, the shoulder 38 on the latch member 35. A retaining collar 58 fastened to shaft in conjunction with the latch member 35 which abuts the fixed bracket 21, serves to prevent axial movement of the said shaft. 3

Fastened on the shaft 35 in spaced relation and arranged between the side members I3, 31 of the frame structure are a plurality of supporting arms or levers 51 to each of which is secured a curved plate 58, each of the latter being provided with slots 53 which, in conjunction with adjusting screws 5|, permit adjustment of the supporting arms 58. At the lower end of the curved plates 58, sheet detaining or withdrawing shoes or members 52 are provided, each of the said shoes being formed of a metal strip suitably bent and folded to form a hollow elongated form and covered with a suitable material 53 such as rubber, leather, felt and the like. The sheet detaining shoes 52 are adapted to contact the sheet while passing over sheet guides or supporting members 64, 55 forming a part of the customary feed table, and while being forwarded by the sheet forwarding roller 55, the latter being rotatably mounted on the frame with its upper periphery adjacent the extremities of the sheet guides. The inner end l5 of the lever J5, when depressed by the thrust of the rod l4 as the tripping mechanism is actuated, will be retained in the depressed position by a detent 51 fastened to the column 13, as best depicted in Figure 2 which illustrates the sheet detaining position of the coacting parts after the cylinder tripping mechanism has moved the rod i4 and the parts connected therewith. The detent 51, it will be observed, has an integrally formed projection provided with an upper angularly positioned face 68 and a lower angularly positioned face 69, which coact or register with corresponding faces formed on lower and upper portions respectively of the inner end l6 of the lever i5. In the untripped position of the device shown in Figure 1, the said inner end of the lever l5 will be engaged on its lower face by the upper face 58 of the detent 61 and thereby maintained in the somewhat raised position shown. In Figure 3, it will be understood, that the positions of the lever i6 and certain of the coactina parts, if shown, would be approximately the same as in Figure 2; i. e., with the inner end of the lever l5 engaged under the lower face 53 of the detent 51, the shoe 52 however, being positioned substantially as shown in Figure 1.

The operation of the device may be summarized as follows:

Assuming a sheet or product S is being forwarded out of proper alignment and prior to its engagement with the front stop II and the sheet grippers (not shown) of the forwarding cylinder I II, a sheet detecting mechanism (not shown) will actuate the tripping mechanism (not shown) which in turn will communicate movement to the lever l2 connected therewith, thereby actuating the connecting levers and links mechanically connected to the levers 22, 23 so that, and in the position shown in Figure 1, the projection 33 will be disengaged from the shoulder 34, thereby permitting the spring rod 44 to turn the said latch member 35, and consequently, the shaft 35 to which the sheet engaging shoes 52 are attached, in a counterclockwise direction from the position shown in Figure 1 to that shown in Figure 2, the projection of the latch member 39 mean:

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while remaining disengaged from the shoulder 4| on the coacting latch member 35. The turning of the shaft 35 will cause the arms 51 toswing to the right as shown in Figure 2, thereby conveying the sheet engaging shoes 52 shown in the latter figure to a position where they are effective to contact and detain the aforesaid improperly fed sheet or product on the sheet guide 55, further movement of the shoes 52 in the same direction being prevented by the contact of the collar 58 with the poppet .48, as mentioned hereinbefore. The positiommf the parts, as shown in Figure 2, will maintain, while the machine is operating, the sheet out of engagement with or from being advanced to the sheet grippers until the shoes 52 have been withdrawn by swinging the hand lever 54 to the left (Figure 1), thereby bringing the stud 55 of the said lever into contact with the shoulder 38 of the latch member 35, and consequently, returning the shoes 62 to the normal inoperative position best shown in Figure 1.

After the spring biased latch member 35 has been released by the withdrawal of the projection 33 from the shoulder 34, and the said member swimg to the position indicated in Figure 2, theispring 28 between the poppets l3, 2| will maintain the projection 40 of the lever extension or latch member 39 in contact with the outer periphery of the other latch member 35. The shoes 52 are reset by swinging the hand lever 28 to the left causing a thrust of the stud 55 of the operating lever 54 against the shoulder 38 of the member 35. The shoulder 4| will then engage the shoulder 48 of the lever 23 as shown in Figure 3. In this position, it is to be understood, the impression is still tripped. To reset the mechanism to the normal position shown in Figure 1, the lever I6 is manually operated to return the inner end l5 of lever IE to its contact with the upper face 58 of the detent 51, thereby simultaneously returning the shoulder 33 of the lever 22 into abutment with the shoulder 34 on the latch member 35, as shown in Figure 1. mechanism is now in the normal untripped position and will remain so until an improperly fed sheet again actuates the tripping mechanism; as described above. This cycle will be repeated whenever a sheet improperly aligned or fed reaches the position shown approximately in- Figure 1.

It will be understood that the invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore desired that the present embodiment be considered in all respects as illustrative and not restrictive, and it will be further understood that each and every novel feature and combination present in or possessed by the mechanism herein disclosed forms a part of the invention included in this application.

What I claim is:

1. The combination of a sheet fed printing machine having a cylinder tripping mechanism and a feed table on which the sheets are registered prior to being taken by grippers on an impression cylinder, a sheet withdrawing member biased to withdraw a misfed sheet and prevent it from being taken by the grippers, a first latch means adapted to hold the withdrawing member in inoperative position during press operation, means connected to the cylinder tripping means to release the said latch means, a manually operated member adapted to move the withdrawing member to inoperative position, and a second latch means adapted to hold the withdraw- The a,144,as1

ing member in inoperative position prior to press operation.

2. The combination of a sheet fed printing machine having a cylinder tripping mechanism and a feed table on which the sheets are 68 8- tered prior to being taken by grippers on an impression cylinder, a sheet withdrawing member biased to withdraw a misfed sheet and prevent it from being taken by the gripp rs, a pair 10 of latches eflective for maintaining the sheet withdrawing member in normal inoperative position, a manually operable member for moving the withdrawing member to an initial inoperative position, and other means connected to the cylinder tripping means for disengaging one of the latches and simultaneously engaging the other latch, to maintain the sheet withdrawing member in position for operation to withdraw an improperly ted sheet when the cylinder is tripped;

WILLIAM F. HUCK. 

